You on the other hand are the one "being sure" about how everything will be fine and of course there is no way for you to bring actual evidence because all you have is conjecture. So, given there is no way for you to back up your argument with evidence, the next best thing you can do is to put some Skin In The Game: can you back up with beliefs with actions? Are you willing to take any substantial risk in case your bet doesn't pay off?